Ernst de Hart
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Ernst de Hart

Software engineer based in Netherlands. Sharing thoughts on software, perfomance, optimizing & web.

This is my new blog. I decided I should split up my blog into a personal life-related stuff and a more technical blog. I have tried before to separate tech stuff from my normal blog, but it was never much of a success. Anyway, that’s why I will post only tech stuff here I’m thinking about or dabbling with—hence the address


I’m a software engineer by occupation. I have practical knowledge of full life cycle system architecture and leading development teams using agile project management principles. I specialize in data sets, concurrency and performance. I have a great interest in functional languages like Clojure.

And also important, I’m deaf but I’m able to communicate with people in spoken language.


  • Teamlead Development at DDC Europe
    • January 2015 – Now
  • Software engineer at DMG Group
    • December 2012 – January 2015
  • Java Software engineer at ADV Group
    • Augustus 2011 – May 2012
    • Data-driven analytics in Java/Scala
    • Xobni gadget (Javascript-heavy; MVC)
    • Worked both as part of a team and alone on projects
    • Worked in a highly collaborative environment
  • Technical Consultant / Co -initiator at Opinionate
    • January 2009 - April 2011
    • First parttime, then fulltime
    • Social media tooling
    • Custom search engine
    • Java with JSF, MongoDB on Tomcat as backend.
  • Freelance developer Ensifex
    • January 2008 – December 2011
    • CMS, custom work.


  • BBA of Business Economics a Public Administration, Avans Hogeschool ‘s-Hertogenbosch
  • Admission medical sciences, Leiden University
  • VWO certificates, Mondriaan College Den Haag


Hans van Rijn, IT manager

Ernst is in staat om met snelheid geavanceerde toepassingen te ontwikkelen. Bij ons werkte hij aan een tag management audit systeem. Dit systeem communiceert naadloos met onze systemen en wordt nu ook door meerdere klanten van ons gebruikt. Ernst levert kwaliteit met duidelijke documentatie, zette gevraagd en ongevraagd activiteiten in gang, die duidelijk meerwaarde hebben. Verder schrikt hij er ook niet voor terug om andere bestaande systemen te verbeteren.

Kortom, een fijne collega.


When I’m not working, I enjoy people, sports, yoga, outdoor, biology, cars, movies, history and so on.